Arm & Hammer has a long-term rebate offer through 2020 where you can get a free Cloud Control cat litter, up to $15.99 in value! There are actually two cat litter rebate offers you can ultimately get. Two free boxes of cat litter might last my cat a whole day!
You can submit your rebate either online or by mail. Simply press the yellow “submit this offer” button for the correctly sized cat litter, then click “Accept Terms and Submit this Offer” and follow the instructions.
The rebate form says you need the original green peelie sticker from the box, plus the receipt and original UPC. However, if you submit your rebate online, they don't ask for the peelie. All you have to is take a picture of the receipt and enter the UPC. I've confirmed many other people have gotten their rebate already by submitting online without a peelie.
[thanks to the awesome anonymous Hiffer who sent this in!]